>no screen or display of any kind
>passively uses battery (only uses considerable power to transmit when buttons are pressed/joystick is moved, otherwise just stays in standby when powered on)
>Wavebird lasts just as long if not longer
>2012 technology

One charge + 80 hours = HOLY FRAK! Why can't we get batteries like this for the 3DS and Smart Devices?!

Click to expand...

Smart devices = running 1.x ghz (or better) processors, gfx chips, bluetooth, wifi, etc. which will eat up ANY battery you put inside.
I have a bluetooth controller with a TINY battery which lasts a good 9 hours. Add this to the fact that the WiiU controllers might well use Bluetooth LE, which uses a fraction of the power of regular bluetooth, 80 hours should easily be possible for a game controller, hell, I've only change the AA batteries in my keyboard twice in the last ten months.